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Is a Java hashmap search really O(1)?
I've seen some interesting claims on SO re Java hashmaps and their O(1) lookup time. Can someone explain why this is so? Unless these hashmaps are vastly different from any of the hashing algorithms I was bought up on, there must always exist a dataset that contains collisions.
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Execute a command line binary with Node.js
I am in the process of porting a CLI library from Ruby over to Node.js. In my code I execute several third party binaries when necessary. I am not sure how best to accomplish this in Node.
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How to get image height and width using java?
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What are the underlying data structures used for Redis?
I'm trying to answer two questions in a definitive list:
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Testing if object is of generic type in C#
I would like to perform a test if an object is of a generic type. I've tried the following without success:
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Overloaded method selection based on the parameter's real type
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How to get unique values in an array
How can I get a list of unique values in an array? Do I always have to use a second array or is there something similar to java's hashmap in JavaScript?
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Using lambda expressions for event handlers
I currently have a page which is declared as follows:
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Select multiple columns in data.table by their numeric indices
How can we select multiple columns using a vector of their numeric indices (position) in data.table ?
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